diff --git a/classes/scheduledTask/ScheduledTaskDAO.inc.php b/classes/scheduledTask/ScheduledTaskDAO.inc.php
index 6ea61bde46f..47413fc0e44 100644
--- a/classes/scheduledTask/ScheduledTaskDAO.inc.php
+++ b/classes/scheduledTask/ScheduledTaskDAO.inc.php
@@ -36,7 +36,7 @@ function getLastRunTime($className) {
 			[$className]
 		);
 		$row = $result->current();
-		return $row ? strtotime($this->datetimeFromDB($row->last_run)) : null;
+		return $row && $row->last_run ? strtotime($this->datetimeFromDB($row->last_run)) : 0;
 	}
 
 	/**